The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . ^^r Fio. ,5.—MoulJ. A perfectly good type is selected, and inserted in a mould speciallymade, called a fusible mould (fig. 5). Sufficient metal of a morefusible nature than thetype is cast round it, andforms a s^pe similar tothat of the ordinary mat-rix. This fusible cast isthen placed in a box pro-tectee! by glass and gutta-percha, in order that thecopper deposit may
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . ^^r Fio. ,5.—MoulJ. A perfectly good type is selected, and inserted in a mould speciallymade, called a fusible mould (fig. 5). Sufficient metal of a morefusible nature than thetype is cast round it, andforms a s^pe similar tothat of the ordinary mat-rix. This fusible cast isthen placed in a box pro-tectee! by glass and gutta-percha, in order that thecopper deposit may bekept square and to theproper dimensions. Thisarrangement also limitsthe deposition to the box is immersed inthe copper electrotypingsolution, in wliich it maybe left until the depositof metal has increased toa thickness at which it may be backed up with copper, or it is left until it reaches thefull thickness, which is about ,^ of an m6h. It is then fittedin line, set, position, and height. The minutest imperfection orblemish is reproduced by the deposition, and the type cast fromsuch a matrix is a perfect counterpart of the original. A school oftype-engravers has recently sprung up in the United States, cut
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Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
